2) C(18, 3) × C(15, 3) × C(12, 3) × C(9, 3) × C(6, 3) × C(3

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2) C(18, 3) × C(15, 3) × C(12, 3) × C(9, 3) × C(6, 3) × C(3, 3) = P(18) / 6^6